2009年6月5日 星期五

[Android] Android Architecture



  1. Applications
    • All applications are written using the Java programming language.
  2. Application Framework
    • Developers have full access to the same framework APIs used by the core applications. The application architecture is designed to simplify the reuse of components
  3. Libraries
    • System C library - a BSD-derived implementation of the standard C system library (libc), tuned for embedded Linux-based devices
    • Media Libraries - based on PacketVideo's OpenCORE; the libraries support playback and recording of many popular audio and video formats, as well as static image files, including MPEG4, H.264, MP3, AAC, AMR, JPG, and PNG
    • Surface Manager - manages access to the display subsystem and seamlessly composites 2D and 3D graphic layers from multiple applications
    • LibWebCore - a modern web browser engine which powers both the Android browser and an embeddable web view
    • SGL - the underlying 2D graphics engine
    • 3D libraries - an implementation based on OpenGL ES 1.0 APIs; the libraries use either hardware 3D acceleration (where available) or the included, highly optimized 3D software rasterizer
    • FreeType - bitmap and vector font rendering
    • SQLite - a powerful and lightweight relational database engine available to all applications
  4. Android Runtime
    • Every Android application runs in its own process, with its own instance of the Dalvik virtual machine.
    • The Dalvik VM relies on the Linux kernel for underlying functionality such as threading and low-level memory management.
  5. Linux Kernel
    • Android relies on Linux version 2.6 for core system services such as security, memory management, process management, network stack, and driver model.

What is Android?
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